What about the visa to Sweden? Is it a face-to-face interview?

Sweden is now a Schengen visa, just like other Schengen visa procedures. You don't need a face-to-face visa. I don't know what kind of visa you need. The official visa time such as company visa or conference visa is very stuck, so the invitation letter must ask the inviter to leave plenty, otherwise it will make you unprepared, unable to book tickets, and sometimes you won't give an extra day.

a study visa is much better. But now, if the visa has not been handed in, it will be terrible. At the end of June, the Swiss staff of the Swedish Embassy will have a holiday, and the Swedish Immigration Bureau will also have a holiday. The visa date may be extremely long, so be patient.

as long as you contact the school to prove that this person has been admitted, you will usually get a visa, so don't worry too much. However, if it is self-funded, sufficient assets and insurance certificates should be provided. You don't need a face-to-face visa, but when necessary, the visa office of the embassy or the Swedish Immigration Bureau may call to verify some things, such as the motivation to go abroad. You must reply carefully, and all the answers will be recorded and sorted out for the record.

If they live in Sweden, it is extremely extreme that they need to be present in person, but this situation is not very good. Usually, they are short of things or have basically been refused visas. They need to see people before making a final decision. This is extremely extreme and rarely happens.

generally speaking, face-to-face signing is not required.